Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36da0ea9a0d4be5eb92187b1c017f28553c2756edd8dd660b2a7975806858854' 
  AND token = '6oQKvLb6TpQKZ14Mney1mZpchVcBQ2QdKi/BiLwniZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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