SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc284623ddcfa0a5df43d1c03e09a883c9ed2a7fb915367fef160ed2d20bc94a' 
  AND token = '4zvVrPT8UDqlhneEgCHWA/2W5/2vCCAwyEzuakPbhLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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