SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7db00c33c6721dd6d8f497de9c0efb387d442f15f4f5bb47d0c841a34f743bea' 
  AND token = 'fXlzbUpDzBBo0fTiic8KLBz+inw1YaKnBZG1h9nztM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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