Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d6279411d69fb856c227e5ba998013b10d56958708390de3e203fa62aa720b' 
  AND token = 'ymVKhg3ibYtJS61COEQY31ksYEVIx30E7id6sR5VhmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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