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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '20528c73a6a03f7ee8b3dc3f23bab4f1af13c96d5d560a8d8cbcc12ad811b529' 
  AND token = 'Q2xopAsc7XwH2sjz4oaFnyAgaaPZ+Pb6P7f27r2W3r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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