Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ffb771a4d7028950976427cf446818fd62effc1d43d86cec891e507e71ecef' 
  AND token = '0kGVGRCok1/Dkszf6wpK5I9WGkn0171UbuOffG8tOxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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