Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c8f4cb441dc72a99cbc3c7dd6e1751937668e9beb35e4abddba084ae24350c' 
  AND token = '5J/9CjNPB7zncsOFtiKXbUZZqECM8wACoSN6LYueaCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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