Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc8e71b190f40284b8f04742bd11c21b249ced5b552e27a3ba7684592fd3341' 
  AND token = 'eUEuV5MkdLGUBOULlLyvREU1PdVlPMww4L4fmij5kWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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