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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6bd25d0e051285107a690c4c797422cc9a3965ceba72c2ee52c05b295f64bd71' 
  AND token = '/jdBsCtIw/1wE9260C9hxx9kdGZ+GFoOAOk5IuIaMy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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