Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83246d33bfa0b0cbb7a9afa120589709315d6a591ae005ab74c25c7c72a74470' 
  AND token = 'svD5oFeuGK7Ia/vyd4LpeHk/CYkQ9yKX+sjwXXS2rK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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