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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd5b78ae8be0d8856466794b2a95b17d73f19e7f9ffefdfe8caa0f477ba785967' 
  AND token = '2G+fGQhcqeHwTOr8NvGRz07tdzzUGEd+ZOYN7XjhD+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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