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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '232260b6c4b56f317ad3cdc21927cd1d2c4227e236ca61edf74711e2100e0d09' 
  AND token = 'txd+qATRuhj6Tu6zITFyEtLZf6+N+kdDdokvt1Jnfic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}