Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9390ab842919a2eafdfd07c445d9a2d76302a8b56435327e961a912ce1cca12' 
  AND token = 'vgw2CnOAq+RTLih2Vtp6pVLnetd4eN8OQUmya9oRycM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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