Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d5c464bb98ff969ce9d34f9a17d5c6adf854b8a8f71b3ca024bbf55aa92b44' 
  AND token = 'mmYKbSac9WnJ/JGbcDAWORzbNxB3BzJn0gaRHh93syg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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