Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06bd453ffae142289671e395fb9e2a5f6a1834d1b9cab86b2bb76c286d4bda5' 
  AND token = 'N/JAvs9R8oNMgsiCgcZuwaqQi/js0VRbNOUNmKw8cTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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