Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa21c73de232f97af579e0cfad5a21a25ec588b465d287b95e73fb1ef26bcd0' 
  AND token = 'YnXLlVMaTbUy6GOVFgqMO1jV/Ds9ylHT/5CuLg0njv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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