Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808cf1f86243ecb03e6b62d1d8df7ed98aec028f6d9f85073a4ded0449dbadf9' 
  AND token = 'eE0PdxzIpNhZ+QoV9PvZi/INKIFII6/vhnaWqTJ2PcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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