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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'da54aea6f72e3708b70ff894e18a949bb0ceda3e541150d6b8be65b9877db81a' 
  AND token = 'CZbv5xEhUawkF2OciX2Nbhzx41fYf2tExZNJquahNUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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