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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8d41e185ec9a8d3850d7799fba64bee81e046de88a4ad3a833c19507473bc6b8' 
  AND token = 'nODfSr5j6SzIBw7bFauiHiuYWk4cBRIVxnaZHewRaNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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