Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3198e258a750aff9a4e9c16afb602127611a7d1eac1cbc4ece7359bab6318740' 
  AND token = 'lxBph57WMBPmCtGDeo1oed0joWhx+1tWunThwGHWInY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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