Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728fe4ef5735fbbf171e47df62d78572957531d1d974b14796f5c595014ef7b3' 
  AND token = 'gtV1I6nCXPqX5okCm+8PSrrVvII9U2C2yEJEr43GYnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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