Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686c7e691ccd0f11e46803a5bbe15ad6f4314ee5dd820033c54e9c3409a5cf20' 
  AND token = '3Ne4pnytO/D/QOP0oyY02guzLGJ7/ZlZkY6F3C/m4M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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