Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a850fbbe2a2bcdddb167827f47078c2d0e48a4854894d20196abefb07509bdcb' 
  AND token = 'QubO/C7DoxdwQolCbHwsbGbkgLOPlEpaga3NNdDCUIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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