Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b495bf91575a58aeed3383f20b6495c0b5a719952289266de46cef7a90e65e6' 
  AND token = 'nnn6sY5xngQhstaSfnrlOmHZ/cL0haVIyZr2X0A0UJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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