SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0de0eaae1fbaa6bdf7df481901fef94fe17925aaa0bf70251172bb5b2e1c6783' 
  AND token = 'yGqVXws4C7wjwv8FBzGPehUmzFzu+sxBKWO5yeWFWqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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