Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a364a2762a9fe273ffb6e18b34c5f57c6d9532b820e983a48b1ad593dac1af7' 
  AND token = 'DRDfUF50ew/jZkb4BaBcj+Qa8TcSXVV8U1cssUVk64o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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