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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9a3ab35785e6b8d39b01cff9f4664fe0631ce6021084a901233da27e5b8fe682' 
  AND token = 'b6c8E60AAVlLg3gbehkx+1ntg8KsRUZbd+uKHuA9z9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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