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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c784b7e24aee5474b8d6cbdeed245fd5fe0586d8834309586c4726738abcffa9' 
  AND token = '2rKNS/cbnlVch0UJbbLv3hSOHOpVSyaPT5va5GEOHSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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