Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5eee338d2ba71540880f83c84a425530e5c270cc89e5efc2ba9dfe559490d14' 
  AND token = '74eZ2siwUS4BkxNRF3J0krXhO3PXEDTZmNWMznonzPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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