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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e0c10a998bd4d8455a258e3127b9740f1c16fe26b451c2dfe8554d323e169878' 
  AND token = 'kPCk47pxq74o6a1evy4dg82Zgmvq1GS89WIzAQVDRGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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