SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f62e4c40e848147f6d24d38793849c02554f4a6948fe5b744b5de7654b5dfdb0' 
  AND token = 'KjBToRJaby4ShIm+vu3RYlmfAImQ/GG/6cFtuE1X8oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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