Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ba77e0aa3f83619e11fb49491e41fc166ce2cb979f59eb3a7673684c457851' 
  AND token = 'EOWeG2KrgHxrs1PXB87YXhEf5A5oh4mn0E/ngMrBZUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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