Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ba48d7b51a266ad36970a4c200621e0e63a80ebdee27c1897fdc1bf4973c24' 
  AND token = 'iqK1Sy6V6zLOncFBnLQJIQTr6mvUjOXgjkp1Rpz2DUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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