Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a492d1f8bdd1546831e7c1668b421266c2bdc08f3475dcdcbbf63ac304963b' 
  AND token = 'Wh9f3iq2pSDu81uZ/dEHyXWnUhN/k1H0VpzUT1DmqJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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