Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fccb78aa2b297bd2d0e7be77c83612a437b1cc040a508d9e8eb3c97f7f2344' 
  AND token = 'Kx06pWNuM+fDOmEAn4YEdKrlPapxlxy7cZboHqVUlLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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