Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f28402004a623866d89ceded957b0798db77215f62c5015bddee17ec9e2073d' 
  AND token = 'IWxo5jsxqV6vUP1Af1U6uh2OKjm/V6hIKFol2xkp92A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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