Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87886b07da94d170e913832e8df92bd78b8de47497991ab439e064fbacfb39c' 
  AND token = 'gZigfSdSOuSEwMI8QuEM60SLCSGiEKPpdQ9nDE01wq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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