Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8add73dfad10bdb3dc3c4261ac1560d3959e02b4fa9f44776ca0c25d915d30' 
  AND token = 'xcUiSuLPXbUcFGnXUFHE79WKgH7l4z5D472qFQCZbxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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