Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d6b54e313d6d1fc886aafd8eb132d42f9f57e26e4cb0cfaeb019d6de500cc3' 
  AND token = 'Om8oDidxjg3FwCPJv9NXzsDilqt6GVW8QiVnL0kNCvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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