SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '045e47efa849448f645af5321c8218193a4cacde9f654a75874c08b2871f7e92' 
  AND token = '6JU3PXAIJpvfmDFAIDqzdUCHrfwnq/en9vDmLBdOLxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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