Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338da9e0052f6a33842e82346b3c17952c503644f882dbb06195958e94a3eb49' 
  AND token = 'PhcfdkCdY78ftznez21Bha7nFoPCau0d9ICDOGtGvJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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