Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5420301a1c35dabb72ea74e5bb411330d31f9c1da1c107dc41361db1f853bd3' 
  AND token = 'xug4hEnHMI0H042pRdposXd7AAUrwKW41uEFu6Ed5cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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