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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5ba5c644a51a88d1c772e110fee8e5e82dbff5d09a8db7db8cd8996bd14eabc4' 
  AND token = 'fTpBO8x9PXq+Sz3qlwIUbrelzDkvJo74lKIGxhivia4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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