Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d60cd7883201793d174518f028aefd83ab872d2e548c69b7324cf32beee0bc' 
  AND token = 'rARmmE07uDF4gJja2GuhYoeNKlf/OT8JUz6kQnUorMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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