Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c293ce923259a5ae2344c74afaa9a5d0429f094cb068e8fa60ef29e323b68654' 
  AND token = 'UqdyRfOaPP8AfZESVci57hXetRuDzPNgnW1N3M/nvpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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