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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '386cb4741d63a3f07df0d53b62b89a3135f0cb7a17c79bf250b4abec584e8662' 
  AND token = 'zt8rNoGqVDiiIwi+rLrNhnHf3r6vh64tfSicer5m1G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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