Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c662f382e226fcdf637a0fbad3739ac6035b81e00c4a58dab4fbb74281449ae3' 
  AND token = 'zjXTHyWhzFaYEPvx1cXLLaJ5fjLqC5rGrD25/DnasZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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