Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca2c960689130a6d6918e3ca0d356e93c94d0244e8f60e372f0c242961d312b' 
  AND token = '21wlzumD/nTViEsc2ytheLedWsBn2qPxQ+IMOAnhE1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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