Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1b40499ea461aa37add93e3bf4da6b72225de2c649d9b21ec39d25bf567d0e' 
  AND token = 'D6GUkrwSE/lfkHc2KZ/a8kjTIDrU/DIoUaEqNrmY38c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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