Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3e72f3035cee76ade8dba9ee86e23c5cd34f19e475fc2f2406ed19ea461184' 
  AND token = 'B9yE1cPEYJqyb/fQK9Nijp5idSRBt8oX7MWoSu+eHEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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