Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6976e7746f544e79cb8a48922364f41d5da644ace5beaad1f0d008cce9947dd' 
  AND token = 'KnH3VqLCzXWKs84QBxTHyetarObtpHtbNOOPDnqVvKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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