Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0dc78f150413d8d2598070770cac151164985bf79f955cac38efcb833492a57' 
  AND token = '6KRsabRTK6LpSaXC0ZSxLpuHgHgsKOH4bKq7Pez94aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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