Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6294f64c2c0533687986852e62fde3dbee3c4ac9d3930497eda0f8522fb59f6' 
  AND token = 'D7JFTz9rpLcK0L4rjFYUSEC2JLli8x5K7XxFKXXqXx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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