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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f73360e541061569ce868efe1474bb8d86ee17d5c8b399a1145f5168e22d1d91' 
  AND token = 'F3QM9U9N7S9gkmSwfNZSr3cT+VXjiZjtZy+2dvd/q54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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