Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6b6cf2b9d0e30aca614c0ec7fa59fdc771a920d2a970cb9d6880a907d431d3' 
  AND token = 'JUDRGlFEwVZccPXkj6ipbPdzDf2mciOrQE/es0NjvHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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