SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '81de7006e12f67929f5bbfae8c1bd7993405fbfdc895d2491fd7259493f3e631' 
  AND token = '74UJxPzkNM8jYYqlBLli0/tqfJRDZRGdnybzkZYq/rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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