Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b477c9ca3cf0c020e1270356eb5fb17771d482d63de46eb51536975e1f486f' 
  AND token = 'cLbvCk4Ae2hHSToiNYBV1dTZR0lbDAqQmMxRrjZb7Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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