Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f06acdeb76cf543434247b7c60646b277b3b3ad829d9dc04874e7b4d1cdff2' 
  AND token = '52ERGqNw3jG60mMTm94DIDfBbooyNDKDphoiaH1qUaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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