Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6245b8bfdf1f0a3bf79820a181b62e3c8e013df9b21890c22f0c3c007aead5' 
  AND token = 'Qg9+RpQmBwkMEIwI/Jbyqq9TTYjwKb1y7y/UnZTT+FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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