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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f1a64331d0391bee2a6c6c6d89db3733e828ef102feea61cc6ba4ffa036fd541' 
  AND token = 'FiXLqV3vIwDcARdNWlUROOIT0P6TfG60lpViSIwXrxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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