Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401685586bf1d30e40ef1034002ef1c7f826d5efa89d54d60a890d2b13cbc98d' 
  AND token = 'IG1jXV43zdhA1MbAZuwsMWJP8Tz0UOqHxvm6z6JQ1+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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