Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50e3177e793956d679c016ff0374326176cdd719e58503eed1165fde8b729a2' 
  AND token = 'isicHr2rpBXG7C5CUEUdwMdA2LAwCrVgwKyac/efwHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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