Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fdbb60ea3161683a109b9a83207265b9af7df444cbee4b8fa6e0f23a16df6d' 
  AND token = 'za92fQCOBBlBhVguIrYERK7QOjHLaN7ysoDElMwBYgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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