Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dfa5357ebbf5bd505088addc2fb07e884dda84c9a2b3568bf5324d361cd65a9' 
  AND token = 'yzUHO18NCgJMvhCzlbEepXah1nPesdIxzmGpajEMzpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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