Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93b5dcc363ed761b3cbf796d4e47cc985dceed4b1a4a5fbfd86096863fa6efa' 
  AND token = 'Ucwd1bRy/ZiioSfvBJOJJ4YNHg/MeTEQNgaz0MXHS40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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