Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd1858ea27b00385f7a44447a213280c7fc452172e8e06425b6819f1fa48b42' 
  AND token = 'LlpWpUuES3f6vH7SjrM1o5ZFQ/8UJ+dLxbDHZk1pgjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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