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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '04a0c7ed704d5017b1b9840e20be2c7ad1dd484424d180348b0fc1ffbbcffbd3' 
  AND token = 'o3NeBJz4z8eT7eMldWiyL+10HAsydWi27eLPYvpHR1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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