SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'adc10270c5c7e2a36174066cb2cf07beb6042160bf306573f552914a3f4397da' 
  AND token = 'mFn4sGPNE0qjrwX8g6brWo+A9Dp5sS0QzwYMPWgXviQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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