Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3c3f7d23ce665529b5ba142ca2b31a625120405b7ad37878133962593acfee' 
  AND token = 'uCCPcZINa5PkUg2ohCaYABd3JZRvR1oQcwO1OK9Qcss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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