Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c96ee85710aec2016c47cc48d48a65f29a3d4b6e532bac60a5b11a9b7c600b' 
  AND token = 'GYR2I/nBcgauoFNgz6LHsSrtC41XvriwNpIqPHpyRGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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