SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c55306ad2f53969de54eb80c07e1b4bef71cbd35c465cb611d2ad6e93827849a' 
  AND token = 'qEGu3zSzlE0YJx7x/z+uVkunIFKqdOFQDKf2/5QSM4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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