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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3c0392905829ebff40fa58760fd0622313d690033eb49f9494a7592d57e54482' 
  AND token = 'y1nXkHuG9aZPNARgRwTO9Civ/5CvbYNpxbuDMS26uAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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