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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '863ef01117c952e3306dd19adfbc80a89f1d6de9ece0ecb26148f7cfab7739d9' 
  AND token = 'k+1foFIO0Oz7Wuc++syFh0hcHRK0udIIpaIJZ11PA3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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