Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9509b42816b5a05199cbbad1bd5f6785fa723a78fbd58ee53c0c2240f5be6b35' 
  AND token = '/RWjISH91CWOk8KCf41OE7/8ggc6CBnFhfsdhsvcV5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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