Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc860eb4d35c9d687af8fe507a2ad830aefb309c4c6430816dcaf0541cb6df28' 
  AND token = 'QHPy6dRAvEX+BI7PShM2rMXD3xy/xpb0ecdWdS1Z4vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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