Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf298ba7f144a53029f68f897b4eca5c73fe72315981d797934e4e7b2ffd410d' 
  AND token = 'iLO85yzAsaIIwyv30RnLpIHcts1Soi+BVy7q6sZI7kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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