Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fa14e53735260235a171b19c595042a1bae418989fc7c2f5189e5815c0aa2b' 
  AND token = 'q7CsNxzu9GkVUGhBgY8dbALKPybV19o4xFOQr6VKWlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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