Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ecb2e24477873319a7da3e4418c3f6ee4665594ba3e0dc0169c4a2cb6b26e7b' 
  AND token = 'zebPizSwTMmZ2xn2Y50PKwoR8xgCBDwp3JBKCpeRstk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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