Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2edee9eb9e6f85cbacb6f56f2f1004a6b8a2ad7eb869a7a52b8dd2da431dfbf' 
  AND token = 'QFt/w853oQIeA/02uUrkupvO7tks2XERUF1Nfg3iMAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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