Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '443ae33188e4b74f16ea9dcb39b7cb9e1d9e122fed44c6f2e7acbfd79cc027af' 
  AND token = 'Zzu92YJ48+4ljOfhWWv7Gd+F0y+Lw50tNXIdT3Rjt5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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