SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '13c7a7ef1a67c69c4ee17d30da83b1404bf1cb0a86b6f8af4b088436818e3a7f' 
  AND token = 'KhWnTzuug06t9vAi9wSCyBZk0qgzaGLz+Ues3CL2YGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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