Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ab544661b69bdfa3e6963c31ae6b0289594518d4199e87d03eec3b9c847b21' 
  AND token = 'bj3FaVnKK0CRhvZsxZ9Szy9NK9i08vcLM/5yCpW5i3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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