Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4fb106455eb87d0b7796f93c192b7c72935da77533a7b6f0e9fda10e1c31577e' 
  AND token = 'AdEXfMtWIZpnGHcuRH5g2D0LPXDz0AdfhA3X35blKSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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