SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '30695c3f682c803434824850d418be51c69e4edba24f38173e35294f3078537a' 
  AND token = '6DAvRFg0V5S9lQNc1xah1+xOeYqD++LBI1yjiYn0q70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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