Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a163be729d0f3c6cb37286d209834f7e2223c08b5300b24fc90b0d20347fb39' 
  AND token = 'YtxhiPAKoIyxg5PFIYFmMCY8Os9IWV8RMPaFIj+bt0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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