Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3033ff72bd6280df0593a82e2e374e8391b4f213284413832a02800039f971' 
  AND token = '6o2NmCoNwwMud1vcLLrgIdWoZHzUKlkPT9Bwd/cxzNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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