SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '547a414fbbfad16392b879fe07ee99ccf9b026516eff91e4be3165b56aca0961' 
  AND token = 'dm6nvB7vcIR8CAP4hLap2OsCCVG06F1B+iNSO1YSsZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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