Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e98c14822c03c761d7eea28939d0eb883c43d20b0158fb10f88c6ca3331f34' 
  AND token = '4CBcr/6vSG7Ue4qATjL9cF2kuP4ZNIhXqdGR8TC6xCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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