Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52d2d71972586f1c20d5e455ebb7d87ec7110ff7234bf6609b41564e65608c8' 
  AND token = '7c5j//+vLioBOvAp+88bEpCZMDye8PVml+nIswL0dQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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