Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18a629b7393ff19084a918ea40fb6ff03adb8417b5b5b2d2fa1eeca5c8a0490' 
  AND token = 'yD5SHwyeUfB+qbGkeQ9nfisRn4JM1tUNUbEiN8Oe4O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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