Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd264d655f3a2ee7e273758c0bf34feed9ebbb02f3a9ab1e348cc81a156dbfc7' 
  AND token = 'EH+btnK1i5ylmmmZei7UNF+rnRnRL1j0KF4R5f+qhow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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