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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7fceca8eebbf87594848f8f4e0f498e1cfb771e1e87ba2180cdc54e5f4d38b68' 
  AND token = 'rLyRaXSzeal+7LSwPB9oGCltvBw+4A9iCanKlL1IB7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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