Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc93ee3602525263e49d4295b319899440436f7525cb75600c008b3e3263aae4' 
  AND token = 'ios5xfPAB+3/AFzWQvHJUbO/QCavfuvAl5ctX1Sj/8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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