Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7bef95fef423756743388d3412876cd2d340c0237426722b15f4cf3822e6e4b' 
  AND token = '4yhB7WtqbhwYg6D+c8bGcdBjYeVP6jyofwsIBdagMTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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