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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bae02d630ef2dee37092123af05912cd42ce4f617a33722a225db90729b2737c' 
  AND token = 'qgv99mWbftGKmSxXlp93FGpqfWBQVDH6W0SJrLGjZkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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